/*
 *
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 *   http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the License is distributed on an
 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 * KIND, either express or implied.  See the License for the
 * specific language governing permissions and limitations
 * under the License.
 *
 */

package org.apache.airavata.metcat.parser;

import java.io.StringReader;
import java.io.StringWriter;
import java.util.List;
import java.util.Map;

import org.w3c.dom.Document;
import org.xml.sax.InputSource;
import org.xml.sax.helpers.DefaultHandler;

import javax.xml.parsers.SAXParser;
import javax.xml.parsers.SAXParserFactory;
import javax.xml.transform.dom.DOMSource;
import javax.xml.transform.stream.StreamResult;
import javax.xml.transform.TransformerFactory;

public class SAXNodeParser implements XMLNodeCapturable {

	@Override
	public Map<String, String> parseXMLNodes(Document doc, Map<String, List<IndexAttribute>> indices) throws Exception {
		InputSource is = this.convertDOMtoInputSource(doc);
		DefaultHandler handler = new SAXNodeEventHandler(indices);
		SAXParser parser = SAXParserFactory.newInstance().newSAXParser();
		
		parser.parse(is, handler);
		
		return null;
	}
	
	private InputSource convertDOMtoInputSource(Document doc) throws Exception {
		DOMSource source = new DOMSource(doc);
		
		StringWriter xmlAsWriter = new StringWriter();
		StreamResult result = new StreamResult(xmlAsWriter);
		
		TransformerFactory.newInstance().newTransformer().transform(source, result);
		StringReader xmlReader = new StringReader(xmlAsWriter.toString());
		
		return new InputSource(xmlReader);
	}

}
